View restrictions can be set-up from the View restrictions formset on any cms page.
Once a page has at least one view restriction installed, only users with granted access will be able to see that page.
Mind that this restriction is for viewing the page as an end-user (front-end view), not viewing the page in the admin interface!

View restrictions are also controlled by the CMS_PUBLIC_FOR setting. Possible values are all and staff.
This setting decides if pages without any view restrictions are:

After setting CMS_PERMISSION=True you will have three new models in the admin index:

Users (page)

User groups (page)

Pages global permissions

Using Users (page) you can easily add users with permissions over cms pages.

You would be able to create an user with the same set of permissions using the usual Auth.User model, but using Users (page) is more convenient.

A new user created using Users (page) with given page add/edit/delete rights will not be able to make any changes to pages straight away.
The user must first be assigned to a set of pages over which he may exercise these rights.
This is done using the Page permissions formset on any page or by using Pages global Permissions.

The Page permission formset has multiple checkboxes defining different permissions: can edit, can add, can delete, can change advanced settings, can publish, can move and can change permission.
These define what kind of actions the user/group can do on the pages on which the permissions are being granted through the Grant on drop-down.

Can change permission refers to whether the user can change the permissions of his subordinate users. Bob is the subordinate of Alice if one of:

Bob was created by Alice

Bob has at least one page permission set on one of the pages on which Alice has the Can change permissions right

Note: Mind that even though a new user has permissions to change a page, that doesn’t give him permissions to add a plugin within that page.
In order to be able to add/change/delete plugins on any page, you will need to go through the usual Auth.User model and give the new user permissions to each plugin you want him to have access to.
Example: if you want the new user to be able to use the text plugin, you will need to give him the following rights: text|text|Canaddtext, text|text|Canchangetext, text|text|Candeletetext.

Using the Pages global permissions model you can give a set of permissions to all pages in a set of sites.